Methods and apparatus for providing a secure paging system
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United States of America Patent
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-
Feb 8, 1994
Grant Date -
N/A
app pub date -
Dec 14, 1992
filing date -
Dec 14, 1992
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
A paging system which sends and receives encrypted messages. The message may be encrypted either by the sender of the message or by the paging system. Multiple keys may be used for encrypting and decrypting. Public key systems may also be used and integrated into this paging system. The paging system can send out time update messages containing the current time and date. The pagers use the time update messages to automatically update the time in an internal clock. Time stamps can be inserted into the encrypted messages to prevent unauthorized users from replaying old messages.
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